Re: eyepiece projection setup recommendations?

Actually, I'm one of the owners of a new, uncompressed frame capture CCD
camera. I was wrong about the CCD... it is actually the same CCD used in
the Lumenera 075 but this camera is made by Imaging Source. Sorry, I don't
have its model number memorized. There was another post recently on the
problems a fellow was having using his Lumenera with a Televue 3x-
vignetting. Believe it or not, but when I used to use a webcam with the
Televue 3x, there actually was some vignetting present. I doubt most folks
notice this, but try the 3x barlow/ webcam combo on the sun (filtered of
course!) and you'll see the vignetting. Another experiment to try is to
center Saturn in your scope with the webcam/3x barlow combo, and then move
Saturn to the edge of the field. Notice the gain dropoff! My conclusion
has been that a Televue 3x really isn't suitable for webcamming because of
the vignetting produced, as the other guy found out with the prior post.
Yeah, I'm being the "squeeky wheel" here, but I need the maximum light
preferably at all areas of the field of view, not just the center. I did
find success with 2" sized Powermates though but unfortunately no 3x barlow
in the 2" size (Televue, are you listening?).

Therefore, now I'm looking at eyepiece projection. The higher end Televues
or Pentax should be ideal and according to the WhatUSee program, vignetting
shouldn't be an issue. Just finding the correct coupler is the challenge.

BTW, George, to answer your question, I had used a Televue 3x with webcam
directly inserted into it for quite some time successfully. There is some
vignetting, as I mentioned above, but this really doesn't become an issue
unless you decide to switch cameras and have a different CCD.

Bill


"George" <george@xxxxxxxxxxxxxxxxxxxxx> wrote in message
news:KjTsf.683553$xm3.242453@xxxxxxxxxxxx
>
> "Chris L Peterson" <clp@xxxxxxxxxxxxxxxxxx> wrote in message
> news:tiu7r1pirq0s67elg2f3njvh1t7t3i6223@xxxxxxxxxx
> > On Thu, 29 Dec 2005 14:38:50 GMT, "Bill Vidicini" <will@xxxxxxxxxx>
> > wrote:
> >
> >>I just purchased a small, industrial video CCD camera that I would like
> >>to
> >>use for planetary imaging (it uses a ICX098BL CCD). The camera has a C/
> >>CS
> >>mount and it was recommended to me to use it in an eyepiece projection
> >>setup...
> >
> > Unless you are using this with a very short focal length telescope,
> > there is no reason to use EP projection. Start by using the camera
> > directly at the focal plane of your scope. Once you are comfortable with
> > its operation, you can use a barlow to increase the effective focal
> > length of your system. With your camera, your ideal focal length for
> > maximizing resolution will be around 3000mm.
> >
> > The only adapter you need is a simple C-to-1.25 barrel. You can get them
> > from Scopetronix and a variety of other places. No need for a camera
> > lens, no need for an eyepiece.
> >
> > _________________________________________________
> >
> > Chris L Peterson
> > Cloudbait Observatory
> > http://www.cloudbait.com
>
> Actually, I have had the same question on my mind recently, and have often
> read others discussing using a barlow, but was unsure if they were
> attaching the camera to it or if they used it in eyepiece projection. I
> would have answered this question for myself if I owned one. I've been
> considering buying a barlow, if for no other reason than the fact that it
> would give me more magnification options. Now I know for sure how it is
> being used with digital cameras and know that it would work just fine for
> my set up. Thanks, Chris.
>
> George
>
>


.

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